1Briggs R E,et al.Attainting visual quality objectives in timber harvest areas landscape architects evaluation[D].USDA For Serv.Res Pap.INT-262.14P.1981.
2Danicl T C,Boster R S.Measuring landscape esthetics:The scenic beauty estimation method[D].USDA Forest Serv Res Pap RM-167,66p.Rocky Mtn Forest and Range Exp Stn.Fort Collins,Colo,1976.
4Julius Braun, H. Martin Schaefer. Fruit size, crop mass, and plant height explain differential fruit choice of primates and birds[J]. Oecologia,2010(164) : 151 - 161.
